Reversing gear for furnaces



Jan. 10, 1933. o, REINER 1,893,786

' REVERSING GEAR FOR FURNACES Original Filed Dec. 28, 1929 2 Sheets-Sheet 1 a. Re Ur jam. 1%, 1933. Q REINER 1,893,786

REVERSING GEAR FOR FURNACES Original Filed Dec. 28, 1929 2 Sheets-Sheet 2 Patented Jan. 10, 1933 or'ro nnnvnn, or RI-IEINHAUSEN, GERMANY REVERSING- GEAR FOR FURNACES Application filed December 28, 1929, Serial No. 417,229, and in Germany January 10, 1929. Renewed November 3, 1932.

My invention relates to reversing gear for furnaces, that is, gear by which the flow of gas from and to a furnace is reversed or deflected. 5 It is an object of my invention to so design a gear of this type that loss of heating gas to the chimney flue is practically el1m1- nated. I

To this end I provide in connection with the usual cowl for spanning two of the fiues, three of which are provided, and with the means for moving the cowl across the fines, mechanism by which the means are operatively connected with a damper in a gas supply pipe, and a detent in the mechanism by which the damper is moved with a jerk.

In reversing gears as designed heretofore,

considerable loss of valuable heating gas to the chimney flue was inevitable. It has al- 0 ready been proposed to shut ed the gas supply before reversing. However, this involves the drawbacks that the closing of the valve, or valves, is rather tedious, and that the flow 3 of gas is interrupted while the gear is being reversed. This is undesirable under all conditions but particularly inconvenient in melting furnaces, such as Martin furnaces, because the melting process is interrupted I for unduly long periods.

Preferably the cooperation of the cowl with the damper according to my invention is so timed that the damper closes with a jerk just before the cowl leaves the means for I making a tight connection about the ends of 35' the lines, generally, a water seal, and opens with another jerk just after the cowl has reestablished the tight connection.

In this manner, loss of gas to the chimney is eliminated, and the flow of gas is inter- 0 rupted for such short periods only that the operation of the furnace is not interfered with.

In the accompanying drawings, a reversing gear embodying my invention is illus- 5 trated diagrammatically by way of example.

In the drawings Fig. 1 is an elevation of the lines in section, v Fig. 2 is a section on the line IIII in 0 Fig. 1,

gear, with the Fig. 3 is agear, and

Figs. 4 to 7 illustrate various positions of the damper in the gas supply pipe, and the mechanism connecting it with the cowl.

Referring now to the drawings, in detail wherein the invention is diagraminatically shown with the parts arranged and proportioned more particularly with the object of illustrating the invention, and first to Figs. 1 to 3, 3 is a casing, S is a hydraulic trough in which the bottom of the casing is immersed, l is the gas supply pipe, with its damper l2, 2 is a regulating valve on the top of the casing, 5, 7, and are three lines extending upwardly through the hydraulic seal, and beyond its liquid level, and 6 is the cowl which spans two of the flues at a time and is alternately moved from the position plan view of the casing of the a u n u y r in F 1g. 1, 111 which it connects the fines o and 7, into a position in which it connects the fiues 7 and a, and back again. 5 and et are fines connected with the furnace, not shown, and 7 is the chimney flue. In the position illustrated, with the damper 1 2 open, and the cowl 6 connecting the fiues 5 and 7, heating gas flows from the pipe 1 through the regulating valve 2 and the casing 3 into the open flue t and to the furnace, while the waste gas from the furnace flows from 5 to 7. In the reversed position, the flue 5 is open, and l and 7 are connected by the cowl 6.

8 is a push rod extending in parallel relation with one of the walls of the casing 3, 9 is a rack on the rod, 10 is a sector fulcrumed at a suitable point of the gear, and 11, 11 are links on which the cowl 6' is pivotally carried.

13 is a bar secured on the rack 9 and extending upwards to a slide 14% on the top of the casing 3. 15, 15 are arms right angles from the slide l4, 16 is a stay connecting the arms 15, 17 is a finger fitted to slide on the stay l6, l9 and are springs interposed between the arms 15 and the finger 17, and 18 is a rack extending at right angles to the finger and secured to, or made integral with, the finger. The slide 14 moves posi tively with the rod 8 and the rack 9, while the finger 17 is entrained by the springs 19 and 20 on the stay 16. 21 is a pinion on the extending at .racl 18 to the ri ht.

shaft 23 of the damper 12 with which the rack 18 is in mesh.

22 is a wheel or disc, also on the shaft 23 of the damper 12, which is equipped with three notches 21 arranged at angles of 90 on its perimeter, and with a tooth 25a, 25?, and 250, at the side of each notch. 27 is a slide which is fitted to move on the top of the casing at right angles to the slide 1-1 against compression spring 32 which is abutted on a projection 33, 26 is a latch on the side which adapted to enter the notches 24 in the wheel 22, 26 a pawl which is tulcruined on the slide 27, 31, 31 are checks limiting the rocking movement of the pawl with respect to the slide, and and 30 are detents on the slide 1% which are adapted to cooperate with the pawl 28.

Suppose that the parts are in the position illustrated in Fig. 1, with the cowl 6 connecting the passages 5 and 7, and the gas flowing from the pipe 1 to the flue a, as indicated by the arrow C. The damper 12 is open, and its control mechanism is in the position on Fig. 4, with the rack 18 in its central position, and the slide 14: displaced to the left. The latch 26 engages the tooth 25b of the central notch 24-. in the wheel 22, the spring 19 is under tension, and the detent 30 engages the left-hand side of the pawl 28. When the rack 9 of the rod 8 is displaced in the direction of the arrow D, Figs. 3, 4, and 5, the slide let moves in the same direction. The cowl 6 is initially raised, the pawl is moved by the detent 30, and the check at the right, 31, is struck by the pawl. The cowl at this movement is just at the level of the hydraulic seal S with its lower edge still closed by the seal. hen the slide 14 moves further, the detent 3O displaces the slide 27 and lifts the latch 26 out of the wheel 22. The spring 19, being under tension, now moves the rack 18 to the left by the finger 17 and the wheel 22 is rotated through 90 degs. until the latch 26 enters the notch 2& near the tooth 25a. The damper 12 is now closed and the parts are in the position as shown in Fig. 5. It will be understood that the spring 19 throws over the damper with a jerk as soon as the wheel 22 is released by the latch 26. The pawl 28 is now located at the left of the detent 30. While this occurs, the movement of the cowl 6 continues and it is raised from the hydraulic seal S, while the damper 12 remains .closed until the cowl is above the flues 7 and 4,

and just begins to enter the water of the seal S with its lower edge, the movementof the slide 14 to the right compressing the spring 20 against the finger 17. The movement of the slide 14: in the direction D is continued. The detent 29 now starts to cooperate with the pawl 28, moving it into contact with the right check 31, and releasing the wheel 22. The spring 20 now under tension, moves the The disc 22 rotates under the influence of the spring 20 anticlockwise until the lateh 26 enters the notch 24 near the center tooth 25?). The damper 12 is now open again, as shown in Fig. 6. During displacement of the slide 14. from the position shown in Fig. 5 to that shown in Fig. 6, the spring 20 is compressed to such an extent that after having turned the damper 12 to open position as shown in Fig. 6 it is still held compressed against the finger 17. In his manner the supply pipe 1 is closed by the damper 12 while the cowl 6 is raised from its water seal, and the pipe 1 is under the action of the chimney draught in the flue 7. Loss of time is eliminated by the detent operation described which throws the damper 12 over with a jerk.

hen the cowl 6 is returned to the position illustrated in Fig. 1, the rod 8 and the slide 14; are moved in the direction of arrow E, Figs. 3 and 7. The operation of the detcnts now reversed, the detent 29 being the first to engage the pawl 28 and, under the tension of spring 20, the rack 11 is moved to the right, rotating the wheel 22 anti-clockwise until the tooth 250 is engaged by the latch which enters the corresponding notch 24-, and the damper 12 is closed. Further displacement in the direction of the arrow E returns the parts into the position Fig. 4, with the damper 12 open.

I claim:

1. Cowl reversing gear for the flow of gas and waste gas in furnaces comprising a plurality of tires, an adjustable cowl associated with said fines, a reversing device for said cowl, a gas supply pipe, a valve in said pipe, and means temporarily closing said valve during the period of reversal of said coil, said means including alternately tensioncd elements interposed between the reversing device and valve, and means to alternately lock and release the valve during reversal of the cowl to permit a snap action of the valve under the influence of the tensioning elements.

2. In a cowl reversing gear for furnaces, three flues, a casing extending across said flnes, a gas supply pipe for said casing, a damper in said pipe, a parthaving three detent means and operatively connected with said damper, a cowl in said casing adapted to connect two of said flues, means for moving said cowl across said flues, mechanism op eratively connecting said means with said damper and including a source of energy, a latch adapted to engage said detent means on said part, and a detent operatively connected with said mechanism for controlling said latch.

8. In a cowl reversing gear for furnaces, three flues, a casing extending across said fiues, a gas supply pipe for said casing, a damper in said pipe, a part having three detent means and operatively connected with said damper, a cowl in said casing adapted to connect two of said fines, means for moving said cowl across said fines, a rack operatively connected with said part, a slide adapted to be reciprocated by said means, springs on said slide adapted to move said rack in opposite directions as said slide reciprocates, a latch adapted to engage said detent means on said part, and a detent operatively connected with said slide for controlling said latch.

4. In a cowl reversing gear for furnaces, three fines, a casing extending across said fines, a gas supply pipe for said casing, a damper in said pipe, a part having three detent means and operatively connected with said damper, a cowl in said casing adapted to connect two of said fines, means for moving said cowl across said fines, a rack operatively connected with said part, a slide adapted to be reciprocated by said means, springs on said slide adapted to move said rack in opposite directions as said slide reciprocates, a latch adapted to engage said detent means on said part, a pawl on said latch adapted to rock thereon between two checks, and detents on said slide for operating said pawl.

In testimony whereof I affix my signature.

OTTO REINER. 

